Electronic component mounting method

ABSTRACT

After a reel of a Moisture Sensitive Device is dispatched from a component keeping area and setup to a tape feeder is performed in an external setup area, exposure time for which the Moisture Sensitive Device is in an atmospheric exposure state is timed in a reel unit, and the exposure time is compared with exposure limit time set for the Moisture Sensitive Device and stored in a storage part. An electronic component mounting apparatus equipped with the reel of the Moisture Sensitive Device whose exposure time exceeds the exposure limit time is specified, and work by the apparatus is stopped.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a Continuation of U.S. patent application Ser. No. 14/127, 376filed Dec. 18, 2013, which is the national phase of PCT/JP2013/001452filed Mar. 7, 2013, which claims the benefit of Japanese PatentApplication No. 2012-106424 filed May 8, 2012, each of which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to an electronic component mounting systemthat mounts electronic components including a moisture management targetcomponent that requires moisture management in a substrate, and anelectronic component mounting method in this electronic componentmounting system.

BACKGROUND ART

In an electronic component mounting system for mounting an electroniccomponent in a substrate and manufacturing amounting substrate, manykinds of electronic components are mounted using plural types ofsubstrates as a target, so that vast kinds and numbers of electroniccomponents are prepared and kept in a component supply department. Inthe production field of component mounting, it is extremely important toproperly manage such a component inventory in reducing production costs.Because of this, efforts to systematize inventory management byindividually identifying an actual component such as a tape reel holdingan electronic component by identification means such as a bar code andintegrating the identification information and correctly grasping acomponent inventory state, for example, at the time of dispatch from acomponent warehouse or the time of supply to a production apparatus andfurther the time of return to the component warehouse have been madeconventionally (for example, see Patent Documents 1, 2 and 3).Accordingly, troubles such as a financial waste due to overstocking or aproduction stop caused by a component shortage due to understocking canbe prevented.

RELATED ART DOCUMENTS Patent Document

Patent Document 1: JP-A-4-267472

Patent Document 2: JP-A-7-44626

Patent Document 3: JP-A-2001-127487

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

An electronic component constructing a mounting substrate includes apackage component previously sealed with a resin. This package componentincludes “a device highly sensitive to moisture (Moisture SensitiveDevice: hereinafter abbreviated as an “MSD”)” in which moisture greatlyinfluences mounting quality after reflow. The MSD is kept in a packingstate set by standards in order to prevent moisture absorption andmaintain a dry state. The MSD unpacked once must complete a process toreflow within available time individually defined according to a kind ofcomponent.

However, in the conventional art including the related art examplesdescribed above, keeping and use of the MSD having the characteristicsdescribed above were left to a mere memory or a record by handwork of aworker of the production field. Because of this, it was difficult tocomply strictly with the available time defined, and it was necessary tofrequently perform further drying treatment for removal of moisture orto reject the MSDs including the MSD having the still possible use inthe case of attempting to ensure the mounting quality after reflow.Thus, the keeping and use of the MSD forcedly caused a situationinterfering with an increase in productivity or a decrease in cost. As aresult, establishment of a system for properly managing use of amoisture management target component such as the MSD has been desired.

An object of the invention is to provide an electronic componentmounting system capable of properly managing use of a moisturemanagement target component, and an electronic component mounting methodin this electronic component mounting system.

Means for Solving the Problems

An electronic component mounting system of the present invention is anelectronic component mounting system that mounts electronic componentson a substrate to manufacture a mounting substrate, the electroniccomponent mounting system having an electronic component mounting linethat performs, by an electronic component mounting apparatus, componentmounting work of mounting the electronic components including a moisturemanagement target component that requires moisture management, awhereabouts information storage part that stores whereabouts informationon the electronic components in a reel unit, whereabouts informationwriting means for storing the whereabouts information on the electroniccomponents in the whereabouts information storage part, an exposure timemanagement part that times exposure time for which the moisturemanagement target component is in an atmospheric exposure state in areel unit and records accumulated exposure time, and amounting linecontrol part that compares the exposure time with exposure limit timeset for the moisture management target component, specifies anelectronic component mounting apparatus equipped with a reel of themoisture management target component of which exposure time exceeds theexposure limit time by the whereabouts information, and stops work bythe electronic component mounting apparatus.

An electronic component mounting method of the present invention is anelectronic component mounting method for mounting electronic componentsincluding a moisture management target component that requires moisturemanagement on a substrate by an electronic component mounting systemhaving an electronic component mounting apparatus, the method including:registering whereabouts information on the electronic components in awhereabouts information storage part in a reel unit and timing, in areel unit, exposure time for which the moisture management targetcomponent is in an atmospheric exposure state; and comparing theexposure time with exposure limit time set for the moisture managementtarget component, specifying an electronic component mounting apparatusequipped with a reel of the moisture management target componentexceeding the exposure limit time by the whereabouts information, andstopping work by the electronic component mounting apparatus.

Advantageous Effects of the Invention

According to the invention, exposure time for which a moisturemanagement target component requiring moisture management is in anatmospheric exposure state is timed in a reel unit and the exposure timeis compared with exposure limit time set for the moisture managementtarget component and an electronic component mounting apparatus equippedwith a reel of the moisture management target component exceeding theexposure limit time is specified and also work by the electroniccomponent mounting apparatus is stopped and thereby, use of the moisturemanagement target component can properly be managed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a configuration explanatory diagram of an electronic componentmounting system of an embodiment of the invention.

FIG. 2 is a schematic diagram showing material management in theelectronic component mounting system of the embodiment of the invention.

FIG. 3 is an explanatory diagram of a material management table in theelectronic component mounting system of the embodiment of the invention.

FIG. 4 is a flow diagram showing component check-in processing in theelectronic component mounting system of the embodiment of the invention.

FIG. 5 is a flow diagram showing feeder setup processing in theelectronic component mounting system of the embodiment of the invention.

MODE FOR CARRYING OUT THE INVENTION

An embodiment of the invention will hereinafter be described withreference to the drawings. FIG. 1 is a configuration explanatory diagramof an electronic component mounting system 1 of an embodiment of theinvention. The electronic component mounting system 1 mounts anelectronic component in a substrate and produces a mounting substrate.As shown in FIG. 1, the electronic component mounting system 1 includesa component mounting line 1 a, a communication network 2, a linemanagement system 3, a member management part 4 and a storage part 5.The component mounting line 1 a is configured to couple a substratesupply apparatus M1, a substrate delivery apparatus M2, a solderprinting apparatus M3, a first electronic component mounting apparatusM4, a second electronic component mounting apparatus M5, a reflowapparatus M6 and a substrate recovery apparatus M7 in series.

In component mounting work by the component mounting line 1 a, asubstrate supplied by the substrate supply apparatus M1 is carried intothe solder printing apparatus M3 through the substrate deliveryapparatus M2. The solder printing apparatus M3 does screen printing ofsolder for component bonding on the substrate. The substrate after thescreen printing is sequentially delivered to the first electroniccomponent mounting apparatus M4 and the second electronic componentmounting apparatus M5. The first electronic component mounting apparatusM4 and the second electronic component mounting apparatus M5 install anelectronic component on the substrate after the solder printing. Thesubstrate on which the component is installed is carried into the reflowapparatus M6. The reflow apparatus M6 heats the substrate according to apredetermined heating profile. The solder for component bonding ismelted and solidified by the heating. Finally, the mounting substrate inwhich the electronic component is mounted in the substrate is recoveredby the substrate recovery apparatus M7.

Before the work by the component mounting line 1 a described above, anelectronic component to be mounted is dispatched from a componentkeeping area 6 and predetermined setup work for use in the componentmounting line 1 a is done in an external setup area 7 and then theelectronic component is supplied to the component mounting line 1 a. Inthe present embodiment, the electronic component in a state housed bybeing held in a carrier tape and wound on a reel 8 (see FIG. 2) istargeted. After the reel 8 taken out of the component keeping area 6 isset in a tape feeder 9 (see FIG. 2) constructing a component supply unitin the external setup area 7, the reel 8 is supplied to the firstelectronic component mounting apparatus M4 or the second electroniccomponent mounting apparatus M5 of the component mounting line 1 a.Unconsumed components left after execution of predetermined componentmounting work are again detached from the tape feeder 9 and are returnedto the component keeping area 6. That is, in the present embodiment, thefirst electronic component mounting apparatus M4 and the secondelectronic component mounting apparatus M5 are configured to supply theelectronic component through the component supply unit constructed so asto set the reel 8 in the tape feeder 9.

Each apparatus included in the component mounting line 1 a is connectedto the line management system 3 through the communication network 2. Theline management system 3 is connected to the storage part 5 and themember management part 4 of a system management computer for performingcentralized control of the electronic component mounting system 1. Themember management part 4 performs processing necessary for membermanagement including each work of acceptance, dispatch and return of thereel 8 to the component keeping area 6. The storage part 5 storesinformation necessary for each processing by the member management part4.

In the electronic component mounting system 1, information about thereel 8 used in the component mounting work includes whereaboutsinformation for specifying a whereabouts location. The information aboutthe reel 8 is managed by the member management part 4 and is recorded onthe storage part 5. That is, whereabouts information about the reel 8 inthe component keeping area 6 or the external setup area 7 is transmittedto the member management part 4 through a wireless LAN etc. and iswritten into the storage part 5. Also, whereabouts information about thereel 8 in each apparatus of the component mounting line 1 a istransmitted to the member management part 4 through the communicationnetwork 2 and the line management system 3, and is written into thestorage part 5. Thus, the storage part 5 functions as whereaboutsinformation storage means for storing whereabouts information about theelectronic component in a reel unit, and the communication network 2,the line management system 3 and the member management part 4 functionas whereabouts information writing means for recording whereaboutsinformation about the electronic component on the storage part 5.

In the present embodiment, the electronic component targeted formounting includes a moisture management target component (which canalternatively be referred to as a “Moisture Sensitive Device”,abbreviated “MSD”) to be targeted for management, the moisturemanagement target component which is highly sensitive to moisture andprevents moisture absorption. Member management processing by the membermanagement part 4 and keeping of the reel 8 of the electronic componentby the component keeping area 6 in the electronic component mountingsystem 1 have a function of performing effective moisture managementusing the MSD as a target. A function provided for member management andmoisture management in the electronic component mounting system 1 willhereinafter be described with reference to FIG. 2.

FIG. 2 is a schematic diagram showing material management in theelectronic component mounting system 1. As shown in FIG. 2, a keepingrack 21, a dry box 22 and a dryer 23 for respectively keeping the reel 8housing the carrier tape in three kinds of different forms are installedin the component keeping area 6. In the keeping rack 21, the reel 8 iskept in a normal atmosphere of normal temperature and normal humidity.The inside of the keeping rack 21 is provided with plural housing plates21 a for housing the reels 8 in a parallel longitudinal attitude. A barcode label 10C for individually specifying each of the housing plates 21a is stuck on each of the housing plates 21 a.

In the dry box 22, the reel 8 housing the MSD is kept at a moisturemanagement level defined on the MSD. The dry box 22 has a moistureadjustment function of always maintaining internal moisture in aprescribed moisture state. The dryer 23 has a heating dry function ofdehumidifying the MSD made unusable by once absorbing moisture due toatmospheric exposure and making the MSD reusable. Bar code labels 10Dand 10E for respectively specifying the dry box 22 and the dryer 23 arestuck on the dry box 22 and the dryer 23.

At the time of dispatch in which the reel 8 is taken out of the keepingrack 21, the dry box 22 or the dryer 23, or at the time of returning thereel 8 after use, in each case, a bar code label 10A stuck on the reel 8targeted for dispatch or return and the bar code labels 10C, 10D and 10Efor specifying the keeping rack 21, the dry box 22 and the dryer 23 areread by a bar code reader 11 as a portable terminal. The readinformation is sent to the member management part 4 by a wireless LANfunction of the bar code reader 11.

External setup work executed in the external setup area 7 willhereinafter be described. In the present embodiment, as shown in FIG. 2,setup work of the reel 8, in which the reel 8 is preset in the tapefeeder 9 having a function of feeding a carrier tape supplied in a statewound on the reel 8 at a pitch before attachment to the first electroniccomponent mounting apparatus M4 or the second electronic componentmounting apparatus M5, corresponds to the external setup work. That is,feeder setup work which is work of setting the reel 8 taken out anddispatched from the keeping rack 21, the dry box 22 or the dryer 23 inthe component keeping area 6 in the tape feeder 9 to construct acomponent supply unit 9* is done in the external setup area 7. At thistime, the bar code labels 10A and 10B respectively stuck on the reel 8and the tape feeder 9 are read by the bar code reader 11. The readinformation is sent to the member management part 4 by the wireless LANfunction of the bar code reader 11.

As shown in FIG. 2, the member management part 4 has a check-inprocessing part 12, an external setup processing part 13 and an exposuretime management part 14 as internal processing functions, and furtherhas a receiver 15. The receiver 15 receives data sent from a portableinput terminal such as the bar code reader 11 manipulated in a region ofthe inside of the electronic component mounting system 1, for example,the component keeping area 6 or the external setup a real. The check-inprocessing part 12 performs record processing in the case where thecomponent keeping area 6 accepts the reel 8, for example, processing ofwarehousing of a component in the component keeping area 6, that is,registration of the reel 8 accepted newly, and re-registration in thecase of accepting the reel 8 having the remaining component returned asthe unconsumed component after a part of the reel already registered isused.

The external setup processing part 13 performs data processing requiredin the case of setting up the reel 8 for the tape feeder 9 executed inthe external setup area 7. The data processing is, for example,processing in which data is read from the reel 8 and the tape feeder 9in a setup work process and is collated with bar code data received bythe receiver 15 to check whether or not combination is correct and alsosetup information for linking these bar code data is created.

The exposure time management part 14 times exposure time for which thecomponent corresponding to the MSD in the electronic components takenout of the component keeping area 6 and used in the component mountingline 1 a is in an atmospheric exposure state in a reel unit, and recordsaccumulated exposure time. Here, the bar code reader 11 reads acomponent ID for the reel 8 dispatched from the component keeping area 6to thereby decide that the component corresponds to the MSD, and therebythe component is targeted for count-up of the exposure time. Also, whenthe reel 8 after use is housed in any of the dry box 22 and the dryer 23and a signal indicating that effect is sent from the bar code reader 11to the member management part 4, a stop of the count-up is controlled.

Information indicating the accumulated exposure time recorded by theexposure time management part 14 is transmitted to the line managementsystem 3. The line management system 3 compares exposure limit time setfor the MSD with the accumulated exposure time at that point in time,and checks the presence or absence of the MSD in which the accumulatedexposure time already exceeds its exposure limit time. In the case ofchecking the presence of the MSD in which the accumulated exposure timealready exceeds the exposure limit time, the line management system 3executes processing in which the first electronic component mountingapparatus M4 or the second electronic component mounting apparatus M5equipped with the reel 8 of the MSD is specified by whereaboutsinformation stored by the storage part 5 and also work by the electroniccomponent mounting apparatus is stopped. Thus, the line managementsystem 3 is a mounting line control part for comparing the exposurelimit time set for the MSD with the exposure time and specifying theelectronic component mounting apparatus equipped with the reel 8 of theMSD exceeding the exposure limit time by the whereabouts information andalso stopping the work by the electronic component mounting apparatus.

The storage part 5 stores various data for mounting operation executionor production management transmitted from the line management system 3and various data acquired through the receiver 15 by the membermanagement part 4 and processed by the internal processing functionsdescribed above. These data are recorded on a production planninginformation storage part 16, a material management information storagepart 17, a moisture management level storage part 18, a keeping locationdata storage part 19 and an inventory information storage part 20 shownin FIG. 2.

The production planning information storage part 16 stores planninginformation transmitted from the line management system 3, that is, atype name of a substrate targeted for production, the number ofsubstrates produced, scheduled date and time of start and end ofproduction, etc. The material management information storage part 17stores management information about a component present in each regionof the electronic component mounting system 1 in a centralized manner.In the present embodiment, these pieces of management information arestored in a form of a material management table 30 shown in FIG. 3. Thematerial management table 30 has data configuration in which a componentname 32 of a component, the remaining number 33, whereabouts information34, an MSD flag 35, exposure limit time 36 and exposure time 37 areassociated with a component ID 31 for individually specifying thecomponent.

The remaining number 33 indicates the number of components remaining.The whereabouts information 34 indicates whereabouts segment andposition of an electronic component corresponding to the component ID31, and includes a keeping location ID, a feeder ID, an apparatus ID anda slot number of a component supply part. That is, when the reel 8 iskept in the component keeping area 6, the keeping location ID forspecifying a keeping location such as the keeping rack 21, the dry box22 or the dryer 23 is assigned to whereabouts information about the reel8 and is stored. Also, when the reel 8 is at external setup work in theexternal setup area 7, the feeder ID for specifying the tape feeder 9 atsetup work is assigned to the whereabouts information about the reel 8and is stored. Also, when the reel 8 is already attached to thecomponent mounting line 1 a and is used, information read at the time offeeder attachment work, that is, the apparatus ID indicating any of thefirst electronic component mounting apparatus M4 and the secondelectronic component mounting apparatus M5, the feeder ID of the tapefeeder 9 in which the reel 8 is set, and the slot number of thecomponent supply part to which the tape feeder 9 is attached areassigned to the whereabouts information about the reel 8 and are stored.Here, the remaining number 33 in the case where the whereabouts is thecomponent mounting line 1 a as shown in the component IDs “0005”, “0006”shown in FIG. 3 is updated in real time through the line managementsystem 3 by sequentially subtracting the number of components consumedby the first electronic component mounting apparatus M4 or the secondelectronic component mounting apparatus M5 in apparatus operation.

The MSD flag 35 indicates a state as to whether or not the componentcorresponds to the MSD which is the moisture management target componentin a form of flag information identified by ON or OFF. In an exampleshown in FIG. 3, a component name “BBB” with the component ID of “0004”,“0005” corresponds to the MSD, so that ON is set in the MSD flag 35. Acomponent of the component ID “0004” corresponding to the MSD is kept inthe dry box 22 (keeping location ID101) in the component keeping area 6,and progression of moisture absorption is prevented. Since a componentof the component ID “0005” is already attached to a feeder of ID#3 andis present in a slot No. 11 in the second electronic component mountingapparatus M5 of an apparatus ID#2, the component is in a state in whichexposure time progresses.

When a component is the MSD, the exposure limit time 36 indicatesexposure limit time indicating a limit of exposure limit capable ofusing the component without trouble. The exposure limit time 36 isindividually defined according to a kind of component and is transmittedfrom the line management system 3 to the member management part 4. Theexposure time 37 indicates accumulated exposure time obtained byaccumulating and adding exposure time timed by the exposure timemanagement part 14. Timing of the exposure time by the exposure timemanagement part 14 is started by registering information about the tapefeeder 9 as whereabouts information about the reel 8 of the MSD by thewhereabouts information writing means described above. That is, the factthat the reel 8 is set in the tape feeder 9 is read by the bar codereader 11, and timing with which its read result is written into thematerial management information storage part 17 of the member managementpart 4 as the whereabouts information 34 is used as a starting point andthe timing of the exposure time for the reel 8 is started.

When the component “BBB” of the component ID “0004” shown in FIG. 3 iskept in the dry box 22 in the component keeping area 6 and the MSD flag35 indicates information about the dry box 22, the exposure timemanagement part 14 decides that moisture absorption of the electroniccomponent housed in the reel 8 is prevented, and stops timing of theexposure time for the MSD. Also, when whereabouts information registeredin the reel 8 of the MSD by the whereabouts information writing meansdescribed above is information about the dryer 23 for removing moistureof the electronic component, the exposure time management part 14decides that a moisture absorption state of the electronic componenthoused in the reel 8 is improved, and decreases the exposure time forthe MSD according to processing time in the dryer 23. When theprocessing time is time sufficient for the accumulated exposure time inthis case, the accumulated exposure time is reset at 0.

The moisture management level storage part 18 stores exposure limit timeaccording to a management level defined every kind of MSD targeted foruse in the electronic component mounting system 1. The exposure timemanagement by the line management system 3 which is the mounting linecontrol part described above determines whether or not componentmounting work by the corresponding electronic component mountingapparatus is stopped by comparing the exposure limit time read out ofthe moisture management level storage part 18 with the accumulatedexposure time timed by the exposure time management part 14.

The keeping location data storage part 19 stores a correspondencerelation between an actual keeping location and the keeping location IDin the component keeping area 6. Here, the keeping rack 21, the dry box22 and the dryer 23 respectively correspond to a keeping location ID1, akeeping location ID101 and a keeping location ID102 (see FIG. 2). Theinventory information storage part 20 stores information about the tapefeeder 9 or the reel 8 used in component mounting work using a kind ofsubstrate targeted for production as a target. The information alsoincludes setup information indicating combination of the tape feeder 9and the reel 8 in the external setup area 7.

Next, an electronic component mounting method executed by the electroniccomponent mounting system 1 will be described with reference to FIGS. 4and 5. In the electronic component mounting method of the presentembodiment, whereabouts information about an electronic component isregistered in a whereabouts information storage part in a reel unit andalso exposure time for which the MSD which is the moisture managementtarget component is in an atmospheric exposure state is timed in a reelunit, and the exposure time is compared with exposure limit time set forthe MSD and an electronic component mounting apparatus equipped with thereel 8 of the MSD exceeding the exposure limit time is specified by thewhereabouts information and also work by the electronic componentmounting apparatus is stopped.

First, the details of check-in processing executed by the check-inprocessing part 12 in the case of warehousing of an electronic componentin the component keeping area 6 will be described with reference to FIG.4. An electronic component targeted for the check-in processing includesboth of the case of accepting a new unused electronic component in thecomponent keeping area 6 and the case of being returned as the remainingcomponent after use is started in the component mounting line 1 a.

As shown in FIG. 4, a component ID of an electronic component carried inthe component keeping area 6 is read by the bar code reader 11 (ST1).The read result is transmitted to the member management part 4 through awireless LAN, and the check-in processing part 12 determines whether ornot the electronic component is an unregistered component by referringto the material management information storage part 17 of the membermanagement part 4 (ST2). In the case of determining that the electroniccomponent is the new unregistered component in step ST2, the electroniccomponent is newly registered (ST3). That is, using the read componentID as a key, a serial No, the component name 32, the number of inputsindicating the number of components per reel and the MSD flag 35 areautomatically read from a host system and are written into the materialmanagement table 30. Accordingly, the remaining number 33 shown in thematerial management table 30 of FIG. 3 is updated and the MSD flag 35 isdisplayed and also when the electronic component is the MSD, theexposure limit time 36 according to an MSD level stored by the moisturemanagement level storage part 18 is written.

Also, in the case of determining that the electronic component is theregistered electronic component in step ST2, it is determined whether ornot the electronic component is the MSD (moisture management targetcomponent) by referring to the material management table 30 (ST4). Whenthe electronic component is not the MSD and is a normal component, akeeping location is the keeping rack 21, so that the reel 8 housing theelectronic component is housed in any housing plate 21 a of the keepingrack 21 and also, the bar code label 10C attached to the housing plate21 a is read as a keeping location ID by the bar code reader 11 (ST5).

Also, in the case of determining that the electronic component is theMSD in step ST4, it is determined whether or not the electroniccomponent exceeds exposure limit time by referring to the exposure limittime 36 and the exposure time 37 of the material management table 30(ST6). When the electronic component already exceeds the exposure limittime, the electronic component cannot be used as it is, so thatnotification to that effect is provided (ST7).

In the case of deciding that the electronic component does not exceedthe exposure limit time yet and can be used, a worker decides a properkeeping location, that is, which of the keeping rack 21, the dry box 22and the dryer 23 the electronic component should be kept in from theaccumulated exposure time of the electronic component at that point intime, and the electronic component is housed in the proper keepinglocation decided. For example, in the case of deciding that the exposurelimit time has a sufficient margin and atmospheric exposure is permitteduntil the time of actual use, normal keeping by the keeping rack 21 isselected. Also, in the case of deciding that the exposure limit time hasno margin and atmospheric exposure is restricted, keeping by the dry box22 is selected. Further, when the accumulated exposure time is near toor already exceeds the exposure limit time, it is decided that dryingtreatment for dehumidification is required, and keeping by the dryer 23is selected.

Subsequently, the bar code label 10 (any of the bar code labels 10C,10D, 10E) stuck on its keeping location is read as a keeping location IDby the bar code reader 11 (ST8). Then, whereabouts information isrespectively registered based on the read result of the keeping locationID in step ST5 or step ST8 (ST9, ST10). That is, in step ST9, as shownin the component name “AAA” of the component ID “0001”, “0003” shown inthe material management table 30 of FIG. 3, a keeping location ID1 isregistered as the whereabouts information 34.

Also, in the MSD, a kind of keeping is checked after step ST10 (ST11).When normal keeping by the keeping rack 21 is checked, the keepinglocation ID1 is registered as the whereabouts information 34 like anormal component. Also, when keeping by the dry box 22 is checked instep ST11, as shown in the component name “BBB” of the component ID“0004” shown in the material management table 30 of FIG. 3, a keepinglocation ID101 indicating the dry box 22 is registered as thewhereabouts information 34 and also, count of exposure time by theexposure time management part 14 is stopped (ST12). That is, whenwhereabouts information registered in the reel 8 of the MSD by thewhereabouts information writing means is information about the dry box22 for keeping the electronic component in a low-moisture environment,the exposure time management part 14 performs processing for stoppingtiming of the exposure time for the MSD.

Also, when keeping by the dryer 23 is checked in step ST11, an input ofdrying time is requested from a worker by, for example, screen displayof an operating panel surface (ST13). The worker inputs the drying timedecided as being proper for the MSD by the request (ST14). Accordingly,the count of exposure time is stopped and also after a lapse of thedrying time inputted, processing for resetting the exposure time for theMSD, that is, for subtracting accumulated exposure time of the amountdehumidified by drying and keeping from the accumulated exposure time orresetting the accumulated exposure time at 0 is performed (ST15). Thatis, when whereabouts information registered in the reel 8 of the MSD bythe whereabouts information writing means is information about the dryer23 for removing moisture of the electronic component, the exposure timemanagement part 14 performs processing for decreasing the exposure timefor the MSD according to processing time in the dryer 23.

Next, feeder setup processing as external setup work executed in theexternal setup area 7 will be described with reference to FIG. 5. Acomponent ID assigned to the reel 8 of an electronic componentdispatched from the component keeping area 6 and moved to the externalsetup area 7 is read (ST21). Then, it is checked whether or not theelectronic component is a proper component by collating the read resultwith component information stored by the inventory information storagepart 20 of the storage part 5 (ST22). When the collated result is NG,error notification to the effect that the electronic component differsis provided (ST23), and the feeder setup is ended.

When the collated result is OK in step S22, it is checked whether or notthe electronic component is the MSD (moisture management targetcomponent) by referring to the MSD flag 35 of the material managementtable 30 (ST24). When the electronic component corresponds to the MSD(Yes in step S24), count of exposure time is started by the exposuretime management part 14 of the member management part 4 (ST25). Inaddition, a target of the count of exposure time includes the case ofsetting the reel 8 of an unused MSD in the tape feeder 9 and the case ofsetting the reel 8 once kept in the dry box 22 or the dryer 23 in thetape feeder 9. In both cases, timing of exposure time is started everyfeeder setup shown in FIG. 5. That is, the timing of exposure time forthe MSD is started in the case of doing work of attaching the reel 8 ofthe MSD to the tape feeder 9 constructing the component supply unit.

Next, it is decided whether or not exposure limit time is exceeded bycomparing the accumulated exposure time to date with the exposure limittime stored in the moisture management level storage part 18 of thestorage part 5 (ST26). In the case of already exceeding the exposurelimit time, the worker is notified of the effect that the electroniccomponent cannot be used through a wireless LAN etc. (ST27), and thefeeder setup using the electronic component as a target is ended. In thepresent embodiment, when exposure limit of the reel 8 exceeds theexposure limit time in the case of doing work of attaching the reel 8 ofthe MSD to the tape feeder 9 constructing the component supply unit,notification to that effect is provided.

Also, in the case of determining that the exposure limit time is notexceeded in step ST26 (the case of OK), the possibility of reaching theexposure limit time within a preset predetermined time is predicted(ST28). That is, when the accumulated exposure time at this point intime is compared with necessary work predictive time presumed to benecessary to use up the MSD of the reel 8 in the electronic componentmounting system 1 and it is predicted to reach the exposure limit timebefore the MSD is used up, notification to that effect is provided by ausage expiration reach advance notice (ST30), and the feeder setup usingthe electronic component as a target is ended. In the presentembodiment, when exposure limit of the reel 8 does not exceed theexposure limit time but it is predicted to reach the exposure limit timebefore the MSD is used up in the electronic component mounting system 1in the case of doing work of attaching the reel 8 of the MSD to the tapefeeder 9 constructing the component supply unit, notification to thateffect is provided.

In the case of determining that there is no possibility of reaching theexposure limit time within the predetermined time in step ST28 (the caseof OK), it is determined that the reel 8 housing the component is anelectronic component usable without problem, and it proceeds to setupwork to the tape feeder 9. In the setup work, a feeder ID of the tapefeeder 9 targeted for setup is first read (ST29). In addition, in thecase of deciding that the electronic component does not correspond tothe MSD in step ST24, the processing proceeds to step ST29 withoutpassing through steps ST25 to step ST28.

Subsequently, it is checked whether or not the tape feeder is a propertape feeder 9 adapted for the electronic component by collating the readresult with feeder information stored in the inventory informationstorage part 20 of the storage part 5 (ST31). When the collated resultis NG, error notification to the effect that the tape feeder 9 differsis provided (ST33), and the feeder setup is ended. When the collatedresult is OK in step S31, setup information and where abouts informationare registered (ST32). That is, the setup information indicatingcombination of a feeder ID of the tape feeder 9 and a component ID ofthe authorized reel 8 set up is recorded on the inventory informationstorage part 20 of the storage part 5 and also the whereaboutsinformation indicating the present whereabouts location is recorded onthe material management information storage part 17 of the storage part5 and thereby, the whereabouts information 34 is written into thematerial management table 30.

The embodiment described above is constructed so as to time the exposuretime from the timing with which it is proved to be the MSD by reading ofthe component ID during execution of the feeder setup shown in FIG. 5,but the timing with which timing of the exposure time is started can beset freely in the range from the time after the start to the timeimmediately after the completion of the feeder setup. For example, itmay be constructed so as to start timing of the exposure time with thetiming of the completion of registration of setup information andwhereabouts information shown in step ST32. In this case, at the timewhen information about the component supply unit including the reel 8and the tape feeder 9 is registered as whereabouts information about thereel 8 of the MSD by the whereabouts information writing means describedabove, the exposure time management part 14 starts timing of theexposure time for the reel 8. Also, when whereabouts informationregistered in the reel 8 of the MSD by the whereabouts informationwriting means is information about the dry box 22 for keeping theelectronic component in a low-moisture environment, the exposure timemanagement part 14 stops timing of the exposure time for the MSD.

As described above, the electronic component mounting system and theelectronic component mounting method of the present embodiment areconstructed so that after the reel 8 of the MSD which is the moisturemanagement target component is dispatched from the component keepingarea 6 and setup to the tape feeder 9 is performed in the external setuparea 7, the exposure time management part 14 times the exposure time forwhich the MSD is in an atmospheric exposure state in a unit of the reel8 and the exposure time is compared with exposure limit time set for theMSD and stored in the moisture management level storage part 18 and theelectronic component mounting apparatus equipped with the reel 8 of theMSD whose exposure time exceeds the exposure limit time is specified andalso work by the apparatus is stopped. Accordingly, use of the MSD canproperly be managed to prevent defects in quality resulting from use ofthe electronic component degraded by moisture absorption.

The invention has been described in detail with reference to thespecific embodiment, but it is apparent to those skilled in the art thatvarious changes or modifications can be made without departing from thespirit and scope of the invention.

The present application is based on Japanese patent application (patentapplication No. 2012-106424) filed on May 8, 2012, and the contents ofthe patent application are hereby incorporated by reference.

Industrial Applicability

An electronic component mounting system and an electronic componentmounting method of the invention have an effect capable of properlymanaging use of a moisture management target component, and are usefulin the field in which component mounting work of mounting an electroniccomponent including the moisture management target component requiringmoisture management is performed.

DESCRIPTION OF REFERENCE NUMERALS AND SIGNS

-   1 ELECTRONIC COMPONENT MOUNTING SYSTEM-   1 a COMPONENT MOUNTING LINE-   2 COMMUNICATION NETWORK-   8 REEL-   9 TAPE FEEDER-   10A,10B,10C,10D,10E BAR CODE LABEL-   11 BAR CODE READER-   15 RECEIVER-   M4 FIRST ELECTRONIC COMPONENT MOUNTING APPARATUS-   M5 SECOND ELECTRONIC COMPONENT MOUNTING APPARATUS

1. An electronic component mounting method performed by an electroniccomponent mounting system having an electronic component mountingapparatus for mounting electronic components, including moisturemanagement target components that require moisture management and normalcomponents that is not moisture management target components on asubstrate, the electronic component mounting method comprising: readinga component identification of an electronic component; determiningwhether or not the electronic component is a moisture management targetcomponent; and registering a keeping location as a keeping rack when theelectronic component is a normal component.
 2. The electronic componentmounting method of claim 2, wherein when the electronic component is themoisture management target component: timing, in a reel unit, exposuretime for which the moisture management target components are in anatmospheric exposure state; comparing the exposure time with exposurelimit time set for the moisture management target component; and placingthe reel unit in one of a keeping rack, a dry box, or a dryer based onthe comparing the exposure time with exposure limit time.
 3. Theelectronic component mounting method of claim 2, wherein the reel unitis placed on: the keeping rack when the exposure limit time has asufficient margin and atmospheric exposure is permitted until the timeof actual use; the dry box when there is no margin in the exposure limittime and atmospheric exposure is restricted; or the dryer when theexposure time has already exceeded the exposure limit time.
 4. Theelectronic component mounting method of claim 3, further comprising:registering whereabouts information on the electronic components in awhereabouts information storage part in the reel unit; and specifying anelectronic component mounting apparatus equipped with a reel of themoisture management target component exceeding the exposure limit timeby the whereabouts information, and stopping work by the electroniccomponent mounting apparatus.
 5. The electronic component mountingmethod of claim 4, further comprising: predicting whether moisturemanagement target components that have not exceeded the exposure timelimit will reach the exposure limit time before the moisture managementtarget components are used up by comparing accumulated exposure timewith necessary predictive time presumed to be necessary to use up themoisture management target components of the reel; and providingnotification when it is predicted that the moisture management targetcomponents that have not exceeded the exposure time limit will reach theexposure limit time before the moisture management target components areused up in the electronic component mounting system.